Electric plug



Patented Dec. 3, 1935 UNrreo stares rA'rENr ori-*ie M2535 ELEGTBQ@ IDLG:

d., li'nll'man, Morini, li'oy, Pa. Application February 23, M533,Serial. No. 658,132

The object or" this invention is to provide the plug with a handle whichmay be used for pull'- ing it out of and putting it into the socket, tothus relieve the conductor proper of strain, this handle being laterallyexible so as to protect the corded conductor from injury by frequentsharp bending at the point of connection with the usual plug proper orcap as more fully hereinafter set forth.

My present invention has particular reference to improvements on theelectric plug covered by my former Patent No. 1,810,439, dated June 16,1931. In the drawing:-

Fig. 1 is a side elevation of my device complete.

Flgfz is alongitudinal sectional view of the device.

Fig. 3 is a detail View of the thimble or ferrule; and

Fig. 4 isa View partly in side `elevation and partly in longitudinalsection, showing my device applied to the plug at the appliance-end ofthe cord.

Referring to Figs. 1, 2 and 3 of the drawing annexed by referencecharacters, 5 designates the body or cap of the plug which carries inthe usual. manner the two terminals 6 adapted to enter the usual slotsin the usual wall socket. The cap 5 is provided with a` central passagethrough which the corded conductor t passes, the two wire conductorsenclosed therein being respectively connected to the usual windingscrews in the cap.

The cap 5 is moulded, as usual, out of some in-n sulating material, andimbedded in the outer face of the cap in the moulding operation is a.collar IUof metal or some hard insulating material. This collar isanchored rigidly in the' cap, and in Order to insure against rotation ofthe cap the collar is provided' with an annular milled bead Il at itsburied end. This collar is interiorly threaded to receive the screw,thread-like cord armor I2 of the usual construction. This armor I 2 isscrewed into the collar I0 until its inner end is approximately flushwith the inner end of 'the collar I 0, and it is then rigidly anchoredto the collar bymeans of a ferrule I3 which is inserted into'the end ofthe tubular armor and is expanded to rigidly clamp the innerwall'thereof. 'I'he body of the ferrule is slightly tapered, as shown inFig. 3, to facili'- tate it being inserted into the tubular armor andthen it is expanded by a suitable tool torigidlyv clamp the armoragainst the inner wall of the collar III. The outer endof the ferrule I3isy provided with an outwardly .extending flange I4 (Ci. 17d-322) winchwhen the ferrule is expanded, is clamped over and against the raw innerend oi the tubular armor i2, the connection between'this ange itl andbody of the ferrule being rounded so as to eliminate an annular cuttingvedge at this g point, which cutting edgewould be undesirable in that itwould be liable to cut or rupture the fabric covering of the cord Inthis way the flexible armor I2 is rigidly anchored to the cap 5 in sucha manner that it can neither turn nor y@ pullout and also so thatno,rough edges will be left that would be likely to fray or cut thecovering of the cable'. In assembling, the parts iii, i2 and it arefirst properly assembled and then the inner end of the collar is mouldedor cast 'is permanently into body cap 5. f

Attached to the outer end of the flexible armor I2 is a pull-knob I5 inthe form of a collar which surrounds the outer end of the armor and isattached thereto in the same manner that the 20 armor is attached to thecollar Ill i. e., by means of a thimble I6 inserted'into the outer endoi the armor tube and expanded in a manner similar to the inner end ofthe thimble it. The outer end of this thimble I6 is flanged outwardly 25at Il and this flange is clamped down over the raw edge of the armortube and is countersunl:l into an annular recess in the collar-knob I5.'Ihe knob I5 is screwed onto the end of the armor tube in the samemanner as the collar I0 is screwed 30 to the tube.

Where the handle is to be applied to the other, appliance-end of thecord, this is done in the manner shown in Fig. 4. I use the usual plugcasing I8 which is divided longitudinally as usual 35 and clampedtogether by screws IB, this casing containing the usual binding screwsfor' connection with'the two wires of the cable. Instead, however, ofcasting or moulding the inner end of the collar-Illin ythe `bodyiIIclamp the same 40 thereinsuciently-rigidlyto avoid rotation in thecasing This casing I8 is` as stated, usually made in two half` sectionsso that it is an easy matter 'to'clampithe-inner end of the collar IIBbetween the halves'of the casingvby simply tight- 45 ening the `screws I9. f

Itvwill be understood thata feature of impor- Y tance lies in the ideaoffscrewing the end of the spiral flexible armor tube into a rigidcollar-like member, such as the collar I0 or the pull-knob 50 I5, andthenfrigidlyl anchoring it therein byA an inserted ferrulewhich isexpanded against the y inner wall-ofthe armor tube to thus clamp thearmor `tube against `thecollarlike member, it being important* that thecollar-like member 55 shall have sumeient strength to permit the ferruleto be expanded without cracking or rupturing the collar-like member.

In accordance with the provisions of the patent statutes, I have hereindescribed the principle of operation of my invention, together with theapparatus which I now consider to reprent the best embodiments thereof,but I desire to have it understood that the apparatus disclosed is onlyillustrative and that the invention can be carried out by other means.

I claim:

1. In a device of the class set forth, a. body, an

one end embraced non-rottively'by said body, a. flexible armor tubehaving an external thread and having one of its ends screwed into thethreaded interior of said collar and extending to the inner end of saidcollar, and a. metal ferrule in the inner end of said ilexible armor,this ferrule being deformed outwardly so as to rigidly and permanentlyclamp the inner end of said ilexlble'armoragainsttheintlorotnideoilcrtotherebyrlgidlyfastentheendofthelnmr tubetothecoiiar. Y

2.Thestructurerecitedinclaim1,theinner annularedge of said ferrule beingcurved oui:- wsrdlytonotonlycovertherawinneredgeof'thearmortubebutalsotopmvideanannuhr rounded edge which. will avoidcutting the mm1 electric fabric-covered cord.

3.Inadeviceoftheclasssetiorth.arigid `(screwed into the threaded e ofsaid body, unyielding collar threaded internally and havingandafernllettedintotheendofsaidarmor' tuhethatlieswlthinthebodyanddeformedperu womens. noLunN.

